'Someone could help me with this exercise for beginners in neo4j,why it returns me anything?

The schematic is:

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The question is:Who are the friends of the friends of Claudia

My code:

MATCH (a:Student)-[:friend]->()-[:friend]->(b:Student) 
MATCH (a:Student)-[:friend]->()-[:friend]->(c:Pet) 
WHERE a.name= "Claudia" 
RETURN a,b,c

database neo4j nosql

Sources

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